/*
 * @Description: 函数表达式
 * @Author: zzj
 * @Date: 2021-09-08 18:19:54
 * @LastEditors: zzj
 * @LastEditTime: 2021-09-08 18:22:14
 */

var foo = function(a,b){
    console.log("result",a+b);
  }
  foo(); //result NaN
  var bar=foo;//复制：引用传递，地址值
